Piston-ring-compressing tool



Oct. 30, 1928.

C. B., PERKINS PIsToN RING coMPREssING TooL Filed March 8, 1928 y a W W 3mm V z r///////////,.0 mp.. n f W Patented Oct. 30, 1928.

UNITED STATES 1,6 esi PATENT OFFICE.

CLARENCE B. PERKINS, OF PROVIDENCE, RI'IODE ISLAND, ASSIGNOR T0 APCO'MOSS- BERG CORPORATION, OF ATTLEBORO, MASSACHUSETTS, A CORPORATION OF RHODE ISLAND.

PISTON-RING-COMPRESING TOOL.

Appncation flied March 8, 1828. serial No. 280,067.

This invention relates to a piston ring compressing tool and has for its object to provide a construction by which the rings of a piston may be compressed and nicely controlled while the piston is being placed in the cylinder of an engine, or similar position.

A further object ofV the invention is to provide handles for the piston ring tool which are so positioned relative to the band for encircling the rings that these handles will not engage surrounding parts and obstruct the entering of the piston into the cylinder while the tool is in its clamping position.

vA still fnrther object of the invention is the deflectingof portions of the edge of the band to stifen the same and also serve as abutments to prevent the entering of the band into the cylinder when the piston with the band attached thereto is positioned in the cylinder.

The invention further consists in the slot-- ting of the band for a portion of its length and the extending of another portion of the band into a position so that the rings will not extend into the slot and be allowed to expand therein, the slot serving as a guide for the expanding or contracting of the band and alsooooperating with other portions of the construction to maintain the band substantially in its encircling position.

With these and other objects in view, the invention consists of certain novel features of construction, as Will be more fully described, and particularly pointed out in the appended claims. i

In the accompanying drawings:

Fig. 1 is a side elevation with a portion of the engine block of an internal combustion engine shown in dotted lines.

Fig. 2 is a top plan view partially in section of the piston ring compressing tool in position about the piston.

Fig. 3 is a sectional view taken on line 3-8 of Fig. 2. w

Fig. 4 is a section taken on line 4-4 of Fig. 1.

Fig. 5, is a perspective view of the clamp plates With the band in dotted lines positioned in its relation to these plates.

Fig. 6 is a fragmental sectional viewlshowing the piston entering a cylinder with a portion of the tool in the position which it assumes relative thereto.

Fio'. 7 is a sectional fragmental view showing the deflected edge poi'tion of the band.

Fig. 8 is a fragmental sectional view showing this deflected portion acting as an abutment against the edge of the cylinder wallto prevent the tool from entering the cylinder.

It is found that, while positioning pistons havingrings thereon into cylinders in internal coinbnstion engines, difficulty is often experienced in compressing the rings sulficiently to permit the entering of the piston into the cylinder and it is found desirable toprovidel a tool to accomplish this purpose which shall have handle members for expanding and contracting the band so positioned thatthe handles will not interfere with the studs and other such obstructions extending from the engine block for securing the headl thereon and .arranged to have suflicient leverageto be easily and readily manipulated by the' operator. The tool. is also readily adj ustable to accommodate different diameters of pisbeing held and guided in its movement through the slot in the band; and the following is a detailed description of the present embodiment of this invention showing one means by which these advantageous results may be accomplished.v

With reference to the drawings, 10 desigi nates the piston having rings 11 thereon and 12 designates a band of alength greater than the circumference of the piston to overlap and provide an inner overlapped portion'18 and an outer overlapping portion 14, .the latter having a slot 15 therein extending from a point adjacent its end 16 longitudinally there- .85 tons by a Vsimple operation, the adjustment of for a substantial distance. The inner overlapped portion is unslotted and extends between the overlapping slotted portion and the piston 10 when the tool is in use so that a ring is prevented from expanding into the slot 15. A pair of handles 17 and 18 are pivoted together at 19 to'move one relative to the other, the end 20 of the handle 17 being connected to the inner portion of the band by means of a trunnion 21 sccured to a plate 22 by riveting as at 28, which plate in turn is secured to the portion 13 of the band by any suitable means such as rivets 211. This trunnion 21 extends through the slot 15 in the portion of the band 14 and has a nut- 25 threaded onto a portion 2G with a washer 27 to secure the end 20 of the handle thereto. This trunnion is shouldered as at 28 to prevent the nut from binding the handle against pivotal movement on the stud.

The end 29 of the handle 18 is adjustably secured to the slotted portion of the band by means of a pair of plates and 30 positioned on opposite sides of the slotted portion of the band. These plates have a tongue and groove connection 31, to prevent them pivoting about a bolt 83 extending through the two plates and the slot 15 for securing them together. Theselplates are bound in position by a Wing nut 34 engaging the threads of the end of the bolt which acts through .a washer 36 and collar 37 to bind the plates in their adjusted positions on the band. The end 29 of the handle 18 is loosely pivoted about the collar 87` and is of a thiekness less than the collar 37 so that it will not be bound by the clamping of the plates together.

The lower edge 38 of the band is deflected or pressed outwardly to form ribs 39 which serve to stiffen the band and also serve as an abutment as illustrated in Fig. 8 to prcvent the band from entering the cylinder 10 when the piston is inserted therein, as illustrated in Figs. 6 and 8. a

By positi'oning' the handles 17 and 1.8 parallel to the axis of the piston, the studs 41 extending from the engine block a2 do not interfere with the positioning of the piston in the cylinder.

It will be apparent that I have provided a tool simple in construction and yet one which is practical and may be utilized for a great variety of different sized pistons by simply acljusting the position of attachment of the handle 18 to the band by means of a thumb nut.

The foregoing description is directed solelyV changes to which the device is susceptible, the invention being defined and limited only by the terms of the appended claims.

I elaim 1. A piston ring compressing` tool comprising a band of a length greater than the circumference of a piston it is intended to encircle to overlap a portion of itself a substantial distance and having a slot extending longitudinally thereof, apair of `handles pivoted together near one end, means extending through said slot and securing' one end of one of said handles to one portion of said band, and means for `adjnst-ably securing the end of the other handle to another portion of said band. a

2. A pist'on ring compressing tool comprising a band having a slot therein extending longitudinally of the band for a portion of its length and an unslotted portion positioned to be between the slotted portion and the piston when the tool is in use to prevent a piston ring extending' in said slot, a pair of handles pivoted together adj acent one end, means for securing one of said handles to the slotted portion of said band, and means for securing the other of said handles through said slot to the unslotted portion of said band.

8. A piston ring co1n] n'essing tool comprising a band of a length to overlap a substantial distance in encircling' a piston, the outer overlapping portion of saidband having a longitudinal slot therein, a trunnion supported by the inner overlapped portion and cxtending through said slot, an adjustable clamp on the slotted portion of said bandhaving a trunnion extending therefrom, a pair of handles pivoted together, the end of one handle connected to one trunnion and the end of the other handle connected to the other trnnnion.

11'. A piston ring compressing tool comprising a band of a length to overlap va substantial distance in encircling a piston, the outer overlapping portion of said band having a longitudinal slot th erein, a trunnion supported by the inner overlapped portion and eX- .tending through said slot, a pair of plates one on each side of the ban-d, means including a bolt extending throughsaid slot for clamping said plates in adjusted position on said band, a pair of handles nivoted together Vadjacent one end and positioned to extend substantially parallel to the aXis of the piston worked upon, an end of one handle engaging said bolt and an end of the other handle engaging said trunnion whereby a relative movement of said handles will serve to eXpand or con' tract the encircling size of said band.

In testimony whereof affix my signature.

CLARENCE B. PERKINS. 

